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Old 03-14-2011, 11:22 AM
ocscully ocscully is offline
Motorized Bicycle Elite Member
Join Date: Jan 2008
Location: Orange County, CA
Posts: 373
Default Re: G4 and sickbikes shift kit

Originally Posted by primusbike View Post
Okay, one step further, what about eliminating the need for the jackshaft in the G4 transmission? Okay, if you were to schematize the power train there are 3 jackshafts to transfer rotational energy to the rear wheel.
1. jackshaft in the G4 (bearing in aluminum)
2. Jackshaft in Sickbikes kit
3. Free wheel/pedal crank. acts as jackshaft

What if you chop the G4 down the center, so the two bearings could be moved further apart. Use a bandsaw and cut it in half. Put the two pieces on a table measure and cut a plate of aluminum to reinforce the two back together. Attach the G4's larger wheel to a 5/8 rod long enough to go through the bearing and the other 2 bearings carrying the jackshaft. Obviously using a bigger belt.
This idea has been done. See link to blog. Alot of good information here nashmoto | blog

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